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经营范围
发明名称
TEACHING AID
摘要
申请公布号
US3570145(A)
申请公布日期
1971.03.16
申请号
USD3570145
申请日期
1969.01.24
申请人
JOSEPH E. HICKEY
发明人
JOSEPH E. HICKEY
分类号
G09B17/00;(IPC1-7):G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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